/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver;

import java.util.List;
import java.util.logging.Logger;

import javolution.util.FastList;
import net.sf.l2j.Config;
import net.sf.l2j.gameserver.instancemanager.ItemsOnGroundManager;
import net.sf.l2j.gameserver.model.L2ItemInstance;
import net.sf.l2j.gameserver.model.L2World;
import net.sf.l2j.gameserver.templates.L2EtcItemType;

public class ItemsAutoDestroy {
	protected static final Logger _log = Logger.getLogger("ItemsAutoDestroy");
	private static ItemsAutoDestroy _instance;
	protected List<L2ItemInstance> _items = null;
	protected static long _sleep;

	private ItemsAutoDestroy() {
		_items = new FastList<L2ItemInstance>();
		_sleep = Config.AUTODESTROY_ITEM_AFTER * 1000;
		if (_sleep == 0)
			// when
			// AUTODESTROY_ITEM_AFTER = 0 but we never know..
			_sleep = 3600000;
		ThreadPoolManager.getInstance().scheduleGeneralAtFixedRate(
				new CheckItemsForDestroy(), 5000, 5000);
	}

	public static ItemsAutoDestroy getInstance() {
		if (_instance == null) {
			System.out.println("Initializing ItemsAutoDestroy.");
			_instance = new ItemsAutoDestroy();
		}
		return _instance;
	}

	public synchronized void addItem(L2ItemInstance item) {
		item.setDropTime(System.currentTimeMillis());
		_items.add(item);
	}

	public synchronized void removeItems() {
		if (Config.DEBUG)
			_log.info("[ItemsAutoDestroy] : " + _items.size()
					+ " items to check.");
		if (_items.isEmpty())
			return;
		long curtime = System.currentTimeMillis();
		for (L2ItemInstance item : _items)
			if (item == null || item.getDropTime() == 0
					|| item.getLocation() != L2ItemInstance.ItemLocation.VOID)
				_items.remove(item);
			else if (item.getItemType() == L2EtcItemType.HERB) {
				if (curtime - item.getDropTime() > Config.HERB_AUTO_DESTROY_TIME) {
					L2World.getInstance().removeVisibleObject(item,
							item.getWorldRegion());
					L2World.getInstance().removeObject(item);
					_items.remove(item);
					if (Config.SAVE_DROPPED_ITEM)
						ItemsOnGroundManager.getInstance().removeObject(item);
				}
			} else if (curtime - item.getDropTime() > _sleep) {
				L2World.getInstance().removeVisibleObject(item,
						item.getWorldRegion());
				L2World.getInstance().removeObject(item);
				_items.remove(item);
				if (Config.SAVE_DROPPED_ITEM)
					ItemsOnGroundManager.getInstance().removeObject(item);
			}
		if (Config.DEBUG)
			_log.info("[ItemsAutoDestroy] : " + _items.size()
					+ " items remaining.");
	}

	protected class CheckItemsForDestroy extends Thread {
		@Override
		public void run() {
			removeItems();
		}
	}
}